/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.table.catalog;

import org.apache.flink.annotation.Internal;
import org.apache.flink.table.api.TableSchema;
import org.apache.flink.table.operations.QueryOperation;

import java.util.HashMap;
import java.util.Optional;

/**
 * A view created from a {@link QueryOperation} via operations on {@link
 * org.apache.flink.table.api.Table}.
 */
@Internal
public class QueryOperationCatalogView extends AbstractCatalogView {
    private final QueryOperation queryOperation;

    public QueryOperationCatalogView(QueryOperation queryOperation) {
        this(queryOperation, "");
    }

    public QueryOperationCatalogView(QueryOperation queryOperation, String comment) {
        super(
                queryOperation.asSummaryString(),
                queryOperation.asSummaryString(),
                TableSchema.fromResolvedSchema(queryOperation.getResolvedSchema()),
                new HashMap<>(),
                comment);
        this.queryOperation = queryOperation;
    }

    public QueryOperation getQueryOperation() {
        return queryOperation;
    }

    @Override
    public QueryOperationCatalogView copy() {
        return new QueryOperationCatalogView(this.queryOperation, getComment());
    }

    @Override
    public Optional<String> getDescription() {
        return Optional.of(getComment());
    }

    @Override
    public Optional<String> getDetailedDescription() {
        return getDescription();
    }
}
